superad

v. t. [ imp. & p. p. Superadded; p. pr. & vb. n. Superadding. ] [ L. superaddere. See Super-, and Add. ] To add over and above; to add to what has been added; to annex, as something extrinsic. [ 1913 Webster ]

The strength of any living creature, in those external motion, is something distinct from, and superadded unto, its natural gravity. Bp. Wilkins. [ 1913 Webster ]

The peacock laid it extremely to heart that he had not the nightingale's voice superadded to the beauty of his plumes. L'Estrange. [ 1913 Webster ]